whirling disease
noun
whirl·ing disease
ˈ(h)wər-liŋ-
: an infectious often fatal disease especially of young salmonid fishes (such as trout and salmon) that is caused by a protozoan (Myxobolus cerebralis synonym Myxosoma cerebralis) and is marked by skeletal deformities and a tendency to swim in circles
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Merriam-Webster unabridged
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